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ELSEIFIDN        ELSE With IFIDN                                    Directive

  ELSEIFIDN <argument1>, <argument2>

     This directive is the same as an ELSE followed by an IFIDN. (IFIDN is
     satified if the two arguments are identical.) It is used to start a
     nested conditional block. For example:

                        IF NUMBER2 EQ 5
                           add ax,3
                        ELSEIFIDN NAME1, NAME2
                           add bx,2
                        ELSE
                           add cx,1
                        ENDIF

       Notes:     See ELSEIF and IFIDN for more information.